802288-74G ASEA
Brand : ASEA
Model number :802288-74G
Origin :USA
Warranty: One year
Permanent magnet synchronous motor is mainly composed of stator, rotor, end cover and other components. The stator is laminated to reduce the iron loss generated by the motor during operation. It is equipped with three-phase AC winding, which is called armature. The rotor can be made into a solid form, or it can be pressed by laminations, which is equipped with permanent magnet material. According to the different positions of permanent magnet materials on the motor rotor, permanent magnet synchronous motors can be divided into two structural forms: protruding type and built-in type. Figure 1 shows the corresponding schematic diagram. The magnetic circuit structure of the protruding rotor is simple and the manufacturing cost is low, but because the starting winding cannot be installed on its surface, asynchronous starting cannot be realized.
The magnetic circuit structure of the built-in rotor mainly includes radial type, tangential type and hybrid type. The difference between them mainly lies in the relationship between the magnetization direction of the permanent magnet and the rotation direction of the rotor. Figure 2 shows the magnetic circuit structures of three different types of built-in rotors. Because the permanent magnet is placed inside the rotor, the surface of the rotor can be made into pole shoes. The pole shoes can be started and damped by inserting copper bars or cast aluminum, and the steady-state and dynamic performance are good. Due to the asymmetry of the built-in rotor magnetic circuit, the reluctance torque will be generated in the operation, which is helpful to improve the power density and overload capacity of the motor itself, and this structure is easier to realize the flux weakening speed expansion.
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Due to the high performance and high reliability of PLC, it has been widely used in the field of industrial control, and has developed from a simple logic control to a multifunctional controller integrating logic control, process control, servo control, data processing and network communication functions. Because PLC itself is not equipped with display function, it becomes very important to realize its internal data display, and it has become a difficulty in the design of PLC control system.
In the PLC control system, the contents to be displayed mainly include timer value, counter value and data register value. The data display method can be summarized into two basic types: one is based on PLC data communication interface, such as RS-232, rs-485/422, and the display device also has such interface to realize data display through data communication.
Data display technology based on communication
Using data communication interface for data transmission and display is an effective way to realize PLC data display. At present, the mainstream PLCs provide standard RS-232 or rs-485/422 interfaces, or add such interfaces through module expansion.
The communication modules 232adp, 232bd, 485bd and 485adp of Mitsubishi FX2N can be used as data interfaces. The display device can select special intelligent display screen and general computer (PC). Directly select the display screen or touch screen matching with PLC, which can realize the centralized display of multiple data in PLC, and can use editing software to edit screen graphics, so as to improve the visibility of the display interface. FX series can be equipped with f93000t-bwd, f940got-lwd and f940got-swd. The smart display reads the register of PL through the communication interface, which has high data display efficiency and can simplify the design of the control system. However, due to the high cost of display, the application of large-size display is limited, so this method is suitable for compact PLC control system. With the further improvement of computer performance and reliability, the “PC+PLC” mode control system has been widely used in the field of industrial control. With rich software and hardware resources, PC can realize the online monitoring of PLC, display a large number of PLC internal data, and display the dynamic process and data trend curve of the control equipment in a graphical manner, making the human-machine interface of the system intuitive and friendly.
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